JPH01500843A - Fuel injection system for diesel internal combustion engines - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Fuel injection system for diesel internal combustion engines This invention is characterized in that the injection nozzle is connected to the fuel pump via a pressure conduit, and the fuel pump The pump includes at least one fuel conduit for inflowing and discharging fuel, a pump chamber, and a pump. a piston, the pump piston being an axial piston actuated by pressurizing means; Diesel internal combustion engine connected to and driven by the engine unit This invention relates to a fuel injection device for fuel injection systems.

A large number of fuel injection systems are known for diesel internal combustion engines. in this case In most of these devices, the pump piston is driven by a camshaft.

According to Swiss Patent No. 539778, the drive of the pump piston is used as a pressurizing means. Fuel injection systems with an axial piston unit actuated accordingly are known. be. The device has a supply pump for fuel. Part of the circulatory system of this device is for supplying fuel to one or more fuel nozzles. This supply pump , connected to the fuel tank and pressure control valve 7. The latter controls the supply pressure of the fuel supply system. control The fuel is fed by a pump to an electromagnetically controlled hydraulic valve and then slides It is introduced into the valve and further into the control piston and injection nozzle. The solenoid valve controls the start and end of injection. The electromagnetic valve is connected to an electric control device that outputs a control signal to the electromagnetic valve. electromagnetic The slide valve connected to the valve has a control valve that flows fuel into the piston surface of the control piston. There are two control ends that do this. On the other hand, the sliding part of the slide valve is The supply pressure of the pump is applied and on the other hand it is less than the force produced by this pump supply pressure. Adds spring force. The control piston is connected directly to the pump piston of the injection pump are doing.

In this case, the pump piston supplies fuel from the pump chamber to the injection nozzle. Pon The flow rate of fuel entering the pump chamber is determined by the pressure governing the supply pump and the fuel flow rate installed in the conduit. Determined by throttle valve.

At the beginning of the injection cycle, the solenoid valve is activated by a control signal that causes the slide valve to The valve of the slide valve directs the fuel toward the working surface of the servo piston. placed in a position to allow passage of water conduits. This servo piston, and thereby the The pump piston is placed in a moving state and the injection process begins. Desired end of injection At this point, a second signal is introduced into this solenoid valve via the electric control device, and this signal Occupying another switching position, the slide valve loads the feed pump from the fuel pressure.

The slide valve slides with the force of a spring and connects the operating surface of the servo piston to the fuel system. Free passage to connect to pressure-free return conduit.

The rise and fall of the injection is interrupted, causing the pump piston and therefore the servo piston to reduce the supply pressure of the fuel system. It bounces by.

The return distance of the servo piston is determined by the amount of fuel inflow. This amount is It is provided by a throttle valve arranged. In the separate conduit, the servo piston is used for all engines. It remains as it is at the end. This position is not fixed, the servo piston With this inaccuracy, the fuel injector is already on the new injection stroke. There is.

The above style of fuel injector can be adjusted approximately by incorporating a slide valve. Enables the use of solenoid valves. However, with these devices, it is difficult to inject the amount accurately. There is a drawback that connects the dots. Electrical controls and the entire fuel system are especially important for diesel engines. Ensures that the correct amount of fuel is supplied to the combustion chamber of a diesel internal combustion engine during fast operation. In order to inject at a precise point, it must be precisely calibrated. This adjustment is difficult and Since fuel injection does not start from the stop in the large load range, the becomes very inaccurate. Correctly remove idle servo pistons due to leakage losses. Unable to position, fuel viscosity changes give different filling degrees. electric time system The controller cannot detect this deviation and cannot balance it. as a result, With multiple pumps or multiple cylinders, different degrees of filling occur. Furthermore, this public Chino's injection device does not have an emergency running device, and the injection process is interrupted when the electric control is interrupted. Cannot be executed. Depending on the fuel used, hydraulic systems have other characteristics, and in some circumstances oil The functionality of the pressure element is no longer guaranteed.

The object of the present invention is to avoid the above-mentioned drawbacks and to achieve a speedy running diesel engine. Even in the case of slow running diesel engines, all types of fuel can be introduced and the fuel The amount of injection is determined volumetrically, regardless of time, so that it can be used even when the electrical part is interrupted. Fuel injection device equipped with a pump piston driven by pressurizing means with a constant running device Our goal is to provide the following.

The above problems are solved as follows by this invention. In other words, the pump pi The piston is connected to the pump chamber (equipped with at least one control end) and this piston The axial piston unit receives fuel via a hydraulic system. It is connected to a pressure source that is independent of the system, and that this pressure source and the axial piston unit are A mechanically and/or electrically switchable hydraulic system between the The idle valve is connected to the pump chamber via a coupling conduit and is operated by fuel. each having one return piston and at least one return piston in the fuel conduit connecting to the pump chamber. The devices are arranged in separate systems and connected to the pump chamber via conduits.

In this invention, the principle of the pump piston equipped with a control end is It is connected to a drive unit equipped with a working drive piston. fuel pump fuel The pressurizing means of the material system and the axial piston unit are interconnected via a control device. It is an independent system. The control device can be switched mechanically and/or electrically having a return piston connected to its outer pump chamber and actuated by fuel . Said coupling conduit leading from the pump chamber to the return piston of the control device is connected to the pump piston. Directly acts on the pressurizing means system via the fuel system together with the control end at the .

Depending on the position of the pump piston or the control end of this piston, the control device Means for pressurizing the axial piston unit, actuated by fuel under high pressure at the desired time The system is controlled. This arrangement ensures that the pump piston returns to the desired distance and is accurately determined. This ensures that the injection pass ends immediately upon expelling the volume of fuel.

In another embodiment of the invention, a seed slide valve of the control device is connected to the control chamber and the axial piston. It has a control end for opening and closing the pressurizing means conduit leading therethrough, the main slide having one end a return operated by the fuel and connected to the pump chamber at the other end, which cooperates with the connecting rod at the Works with the piston. At least a portion of the connecting rod forms the core of the electromagnetic coil; The electromagnetic coil is connected to an electric pulse generator. In addition, the connecting rod is mechanically This isolating device places the connecting rod and the control end of the main slide valve in the control position. Fix it.

An advantageous embodiment of the invention can be characterized as follows. That is, hydraulic system The control i75 device is connected to the control camshaft and acts on the connecting rod of the control device of the cam disc. . With this arrangement, the camshaft only needs to move the control member, so it It is possible to introduce a system axis.

This is the opposite of an injector. In the injector, the camshaft drives the pump piston. requires a heavy and expensive construction. The control camshaft is connected to the main slide valve. It acts directly on the connecting rod, and can be used as an operating function member of the main slide valve, or as an electromagnetic coil. In case of damage, it will be used as an emergency control section. In another configuration of the invention, the axial The piston serves double duty and opens into a working chamber with a complete working piston surface The pressurizing means conduit is introduced directly into the pressure source.

Other improvements to the fuel injection system are achieved as follows. i.e. pump piston The upper end surface of the directional piston forms the first control end and is oriented toward the longitudinal axis of the directional piston. A second control end is provided at the base, and a groove is provided obliquely to the longitudinal axis. It is connected to the direction chamber via a main passage, and the pump cylinder has a pump piston. the first control end at the bottom stop of the pump piston, and the second control end at the top stop of the pump piston. At least one passage for fuel underneath the control end is provided. this In another embodiment of the invention, the passageway in the fuel conduit together with the control end forms a second control device. It is connected via a coupling conduit to two return pistons of a hydraulic system control device.

An improved embodiment of the second control device is characterized by the following. That is, This second control in the fuel line controls the overflow/intake valve and this overflow. It consists of a switching piston that acts on the shaft of the low/intake valve, and this overflow/ The suction valve is connected via the supply conduit to the upper end of the pump chamber and also to the piston chamber of the switching piston. is connected to the through-hole of the pump cylinder via a conduit. With this arrangement, The pump cylinder opening can be configured to optimally adjust the control function. fuel Inflow and outflow into the pump chamber is carried out through the supply conduit at the upper end of the pump chamber. .

In this case, the dimensions of the pump chamber and the dimensions of the overflow/suction valve are It is set optimally for the exit process.

When operating the fuel injection device according to the present invention, a known control device is used. Using a pump piston that controls the desired amount of fuel injected depending on the engine output is set at the position that determines the The start of the injection process is initiated by the electromagnetic control of the control device of the pressurizing means system. This can be done by electrical pulses through the coil or by a control camshaft. this The control device opens the flow of the pressurizing means leading to the axial piston unit and Knit moves the pump piston. In that case, the fuel in the pump chamber is pressurized . Once a certain pressure is reached, the inlet valve leading to the injection nozzle opens and the fuel enters the diesel. Introduced into combustion engines. When the pump piston returns the desired distance, the pump chamber is closed to the coupling conductor. Connected to the control device via a pipe, the pressure shock passes through the return piston to the main slide valve The pressure means is thereby brought into the return position of the axial piston. Knit full drive prevent it from being introduced to the piston surface. The ring surface moves further and directs the axial piston. This causes a rapid pressure drop in the pump chamber. The amount of fuel injected is determined only by volume. This fuel injector is extremely accurate. The reason is that the delay circuit This is because it is unnecessary. The start of the injection process is confirmed by known real-pressing means. The actual decision is made and communicated to the control device. By separating the fuel system from the pressurizing means system. Therefore, special hydraulic fluids or other additives are required to ensure the desired lifespan of the fuel injector. Pressure means can be introduced. The inclined end control part of the pump piston is made by pressurizing means. Coupling to a moving drive unit provides very high drive reliability and structural separation. give. The greater advantage of this fuel injector is that the entire component is axially connected. If a large number of injection parts are arranged, each one can be arranged in succession. Not related to other powder parts Ru. This is especially true when driving at high speeds and with large diesel engines. It is essential. Despite the above, the emergency control has a lightweight camshaft guaranteed via the camshaft control.

In the following, the invention will be described in detail based on embodiments in conjunction with the accompanying drawings. child Here, Figure 1 shows a fuel pump equipped with a drive unit, main slide valve and pressurizing means system. Schematic longitudinal cross-sectional view.

FIG. 2 is a schematic vertical sectional view of a fuel pump equipped with a second fuel system control device.

Figure 3 shows the control system for the pressurizing means system, which is equipped with a main slide valve shutoff device and a camshaft control section. FIG.

FIG. 1 shows - injection nozzles 1, - fuel pumps 3, and an axial piston unit. 20 and the fuel injection device equipped with the control device 31 are not shown. The fuel pump 3 is It consists of a pump cylinder 4 equipped with a pump chamber 6 containing a pump piston 7. There is. This pump cylinder 4 is connected to a conduit 15, a fuel passage 5 and a discharge conduit 16. Equipped with a fuel conduit consisting of:

This fuel conduit is part of a fuel system that transports fuel under relatively low pressure. . A return valve 17 is integrated into the fuel conduit 15 . This valve allows the fuel to The pressure shock generated in the fuel passage 5 is transmitted to the fuel conduit 15 when the flow is reversed to the fuel conduit 15. This is to prevent this. To reduce pressure shocks, the fuel discharge conduit 16 should be A valve 18 is incorporated. From the pump chamber 6, a pressure conduit 2 leads to the injection nozzle 1. ing.

A control valve 19 is connected to this pressure conduit 2 .

This valve opens the flow to the injection nozzle 1 when the pump chamber 6 reaches a predetermined pressure. , when the pressure decreases, the pressure line 2 is again shut off.

The pump piston 7 connects with the axial piston of the axial piston unit 20 at its lower end. It is connected to 22.

This pump piston 7 not only slides axially but also by means of an adjusting device 60. It can rotate around the longitudinal axis 8. The adjustment device 60 is equipped with an inclined end control section. The device known in the case of fuel injection pumps is of interest. Axial pistons, two The kit 20 includes a cylinder 21, an axial piston 22, a working space 25, and a ring chamber. It consists of 26 pieces. The horizontal piston 22 has a dual role, and the working space 25 It has a piston surface 23 opposite to. ,゛. The piston surface of is attached to the ring chamber 26. It faces the ring surface 24 to which it belongs.

The axial piston unit 20 is a component of the pressure means system. This pressure means system Any known pressure means can optionally be introduced into the element. In this example , high pressure hydraulic fluid is used. This pressurizing means is connected to the pressurizing means conduit 27.28. It leads to the axial piston unit 20 via. These conduits are pressure source 2 It is supplied from 9.

A control device 31 is integrated between the pressure source 29 and the pressure means conduit 27. this The control device 31 includes a main slide valve 32, a return piston 34, and an attached magnetic core 39. There is an electromagnetic coil 38 , a mechanical cutoff device 41 , and a camshaft control 61 .

The pressurizing means system with hydraulic fluid is separate from the fuel system and is connected to the axial piston 2. The operating movement of 2 is controlled by the main slide valve 32. This main slide valve 32 is shown in detail in FIG. 3 and includes two slides with control ends 64, 65. It has a valve body 62,63.

The slide valve body 62 has a control chamber, and the slide valve body 63 has a control chamber 67. is arranged. A third control room 68 is located between the two. Slide valve body 62 or 63, a pressure relief chamber 69.70 and an airtight piston 71.7 2 is installed. In this case, the pressure release chamber 69.70 is - a wooden drain conduit 8; It is connected to 8. The slide valve body 62.63 and the airtight piston 71.7.2 are , are arranged at regular intervals and are interconnected by a core 73. main slide A connecting rod 37 is disposed at one end of the valve 32. This connecting rod slides It is connected to the valve body 63. In this case, a part of the connecting rod 37 is attached to the electromagnetic coil 38. A core 39 is formed.

The connecting rod 37 projects from the electromagnetic coil 38 and is interrupted by a mechanical interrupting device 41. surrounded by people.

A camshaft control end 61 is connected to this mechanical shutoff device 41 .

On the side opposite to the main slide valve 32, a return piston 34 is connected via a plug 74. It cooperates with the C slide valve zero body 62. A piston chamber attached to this return piston 34 75 is connected to the fuel system via coupling conduit 33. This coupling conduit 33 is As can be understood from Fig. 1 and Part 2, it communicates with the pump chamber 6 of the pump cylinder 4. The water flows into the through passage 14.

The pressurizing means system is driven by a pressure source 29.

In this case, a pressure regulating valve 30 is provided to control the pressure in this system. pressure From the source 29 a pressure conduit 35 is directed to the main slide valve 32 and another pressure conduit 28 is directed to the shaft. It opens towards the ring chamber 26 of the directional piston unit 20 . The return conduit 36 is , the main slide valve 32 leads to a pressure means reservoir 76 .

At the outlet position shown in FIG. It flows into the pump chamber 6 via the. In this case, the pump piston 7 is at the lowest end. The axial piston 22 connected to the pump piston 7 is also at its lower stop. Main stream The ride valve 32 is held in the outlet position by a spring 77, and the slide valve body 62 is , the connection of the pressure conduit 35 leading to the pressurizing means conduit 27 is interrupted. At the beginning of the injection process The electromagnetic coil 38 is excited by the electric pulse generator 40, and the electromagnetic coil 38 is excited via the connecting rod 37. The main slide valve 32 is then displaced in the direction of the return piston 34. In this way, the slide The valve body 62 opens the communication between the control chamber 66 and the control chamber 68 on the one hand and slides on the other hand. Valve 63 blocks communication between control room 68 and control room 67. Therefore, the pressurizing means is , is brought to a high pressure and flows from the pressure conduit 35 into the pressurizing means conduit 27, and the axial piston unit It flows into the working chamber 25 of the knit 20. The axial piston 22 slides upwards and pumps The pump piston 7 is butted against the upper end of the pump chamber 6. This axial movement sea As a result, the pump cylinder 40 passage 14 is blocked, and the pressure in the pump chamber 6 increases.

When the predetermined pressure is reached, the control valve 19 opens and the fuel flows through the injection nozzle 1 Injected into the combustion chamber of an easel internal combustion engine. The pressure governing the pump chamber 6 is The control end 12 is connected to the through passage via the passage 13 arranged in the case of the piston 7. 14, the pressure impulse traveling at the speed of sound immediately occurs in the fuel passage 5 and the coupling conduit 33. The attack spreads. This pressure shock enters the piston chamber 75 of the control device 31 and the return piston The main slide valve 32 is immediately moved 4 times in the direction of the electromagnetic coil 38 via the stone 34. Ru. Therefore, the pressure conduit 35 and the control chamber 66 are shut off by the slide valve body 62. A slide valve 63 having a control end 65 provides communication between control chamber 68 and control chamber 67. , thus opening communication between the pressurizing means conduit 27 and the return conduit 36. axial piston In the operating chamber 25 of the ton unit 20, the pressure immediately decreases, and the pressure in the ring chamber 26 decreases. causes the axial piston 22 to stop and start moving in the return direction. In pump room 6 The pressure increases and the control valve 19 shuts off the pressure line 2 at a predetermined value. pump As soon as the control end 10 formed by the upper end surface 9 of the piston 7 reaches the through passage 14, Then, the pump chamber 6 is again filled with fuel and the pump piston/axial piston 227 ) remains at the lower end stop of the monitoring position until a new injection cycle begins.

The fuel injection device shown in FIG. 2 includes a 20% 8iB device 42. pump piston 7. The axial piston unit 20 and control device 31 are shown in FIG. It is formed in the same way as in the example above. The pump cylinder 4 further includes a through passage 1. 4, a supply conduit 46 for fuel is arranged. This fuel is at the top of the pump chamber and flows into this pump chamber. The second control device 42 has an overflow chamber 53. There is an overflow/intake valve 43, a switching piston 44 and a balancing valve 54.

The overflow chamber 53 is connected to the fuel passage 5 via the communication conduit 52 at 7, and to other sources. It is connected to the fuel discharge conduit 16 at one end. A piston located at the bottom of the switching piston 44 The ton chamber 45 communicates with the through passage 14 via a conduit 47. Switching piston 4 4 is attached to the shaft 48 of the valve. In this case, overflow/intake valve 4 3 is held in the blocking position by a spring 50. At the bottom of the switching piston 44 is equipped with another spring 49, which is connected to the valve shaft 4-day switching piston. 44 is pressed. The balancing valve 54 is designed as a return valve and is inserted through the hole 55. It is connected to the piston chamber 45 through the piston chamber 45 . In the pump chamber 45 less than in the conduit 16 When pressure is created, the valve 54 opens and the valve seat 56 opens, so that the fuel flows into the piston. It flows into chamber 45 and conduits 47 and 33.

When starting the working stroke of the pump piston 7, the control end 10 is connected to the through passage 14. is closed, and the pressure generated in the pump chamber 6 presses the valve 43 against the valve seat 51. . As soon as the control end 12 reaches the through passage 14, a pressure impulse passes through the return piston 34. Via the shear conduit 33 to the control device 31 and via the conduit 47 to the piston chamber 4. 5 and eventually to the switching piston 44. I have already explained this in the case of Figure 1. Thus, the movement of the axial piston is interrupted by the control device 31. Switching piston 4 4 passes through the overflow/suction valve 43 via the valve shaft 48. Open immediately. Therefore, the pressure prevailing in the pump chamber 6 is transferred via the conduit 46 to the It is reduced in the bar flow chamber 53, that is, in the fuel conduit 16. This pressure drop in pump chamber 6 The control valve 19 closes immediately and at a predetermined precise point, allowing fuel to flow to the injection nozzle. This results in the prevention of

FIG. 3 further shows a mechanical shutoff device 41 and a camshaft for the main slide valve 32. The control unit 61 is shown. This mechanical shutoff device 41 substantially includes a shutoff body 78, a claw 79 and a cutoff bolt 80. The connecting rod 31 projects into the blocking body 78. It extends out and has a shoulder 81 in that area. This connecting rod 37 is connected to the electromagnetic coil. When slid to the left by the lever 38, the shoulder 81 entrains the blocking body 78 and springs A claw 79 that operates with is fastened to the cam 82. Eventually, the current supply leading to the electromagnetic coil 38 is interrupted and there is never any risk of overload or overheating. The return of the connecting rod 37 is the injection At the end of the process, it is carried out via a return piston 34 actuated by the injection pressure. Ru. In this case, the connecting rod 37 is pushed to the right against the force of the spring 83 and the shutoff bolt This will drive the tip 80 outward. The cutoff bolt 80 slightly lifts the cutoff claw 79. to open the cam 82 at the blocking body 78. The spring 77 is now connected to the blocking body 7. Push 8 back to the exit position again.

For safety reasons, in the illustrated example, the camshaft is further connected to the electromagnetic coil 38 of the injection control section A control section 61 is provided. This control section includes a cam disk 8 equipped with a cam 85. 4, and a discharge roller 86 fixed to the blocking main body 78. The camshaft is , is driven by the illustrated retainer drive connected to the crank drive. electric If the electromagnetic pulse generator 40 or the electromagnetic coil 38 malfunctions, or the current is cut off. In this case, the cam 85 controls the blocking body 78 via the ejection roller 86 and thus the injection process. Initially, the connecting rod 37 is driven to the left. Movement of the blocking body 78 and connecting rod 37 requires only a small amount of force; the camshaft and the controls for this shaft can be easily and It can be formed without incurring large dynamic costs. Return of the connecting rod 37 at the end of the injection process This is done in the same way as above. In the illustrated example, a second Two electromagnetic coils 87 are also provided. Both coils receive electrical pulses via electrical conductors. receives electrical pulses from a pulse generator 40; This electromagnetic coil 87 is operated by electric pulses. The connecting rod 37 can be slid to the right. Therefore, the injection process should be interrupted early. can be done. By sliding this main slide valve 32, the axial piston unit 20 axial piston 22 can be deactivated and the piston 22 can be returned so that the injector An emergency stop can be performed.

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Claims (1)

[Claims] 1. The injection nozzles each lead to a fuel injection pump via one pressure conduit, The fuel pump has at least one fuel conduit for inflowing and outflowing fuel. It has a cylinder, a pump chamber, and a pump piston, and the pump piston is pressurized. connected to an axial piston unit actuated by means; Fuel injection system for diesel internal combustion engines driven by piston-directed units In the position, the pump piston (7) has at least one piston connected to the pump chamber (6). It is equipped with two control ends (12) and can be rotated about the longitudinal axis (8) and axially The piston (20) is connected via a hydraulic system to a pressure source (29) that is independent of the fuel system. Subsequently, in this hydraulic system, between the pressure source (29) and the axial piston unit (20) a mechanically and/or electrically disconnected valve having at least one main slide valve (32); A replaceable control device (31) is provided, which control device (31) A pump connected to the pump chamber (6) via a conduit (33) and operated by fuel. Both have one return piston (34) and are connected to the pump chamber (6). The tubes (15, 5, 16) have at least one other control (10, 12, 14 or 42), which is connected to the pump chamber (6) via the fuel conduit. A fuel injection device characterized by: 2. The main slide valve (32) of the control device (31) is connected to the axial piston unit (2). Control chambers (66, 67, 68) that open and close pressurizing means conduits (27, 35) leading to ) and control ends (64, 65), the main slide valve (32) having one end At one end, together with the connecting rod (37}, and at the other end, it is operated by fuel and the pump chamber (6) co-operating with a return piston (34) connected to the A fuel injection device for a diesel internal combustion engine according to scope 1. 3. At least a portion of the connecting rod (37) connects the core (39) of the electromagnetic coil (38). and this electromagnetic coil (38) is connected to an electric pulse generator (40). A fuel injection system for a diesel internal combustion engine according to claim 2, characterized in that: Place. 4. The connecting rod (37) is part of a mechanical disconnection device (41), which (41) is the control end (64, 65) of the connecting rod (37) and main slide valve (32) The slide valve main body (62, 63) having a A fuel injection device for a diesel internal combustion engine according to claim 2. 5. The control device (31) in the hydraulic system is connected to the camshaft control section (61), and The disc (84) is characterized in that it acts on the connecting rod (37) of the control device (31). A combustion engine for a diesel internal combustion engine according to any one of claims 1 to 4, fuel injection device. 6. The axial piston (22) has a dual action and communicates with the working space (25). The sliding pressure means conduit (27) is connected to the pressure source (29) via the control device (31). Also, the piston (22) has a ring chamber (26) having a ring surface (24). Claim characterized in that the pressure means conduit (28) leads directly to the pressure source (29) Fuel injection for a diesel internal combustion engine according to any one of items 1 to 5 in the range of Device. 7. The upper end face (9) of the pump piston (7) forms a first control end (10). , towards the longitudinal axis (8) at the case of the pump piston (7). A groove (11) is provided having a second control end (12) intersecting the manual axis. This groove is connected to the pump chamber (6) via the passage (13) and the pump cylinder A through passage (14) for guiding fuel to the fuel conduit (5, 16) is provided in the da (4). , and this through passage connects the second control end (12) at the upper stop point of the pump piston (7). The disc according to any one of claims 1 to 6, characterized in that: fuel injection system for diesel internal combustion engines. 8. The passageway (14) equipped with a control end (10, 12) carries a second control device. and the return piston in the control device (31) of the hydraulic system via the coupling conduit (33) Diesel according to claim 7, characterized in that it is connected to a ton (34). fuel injection system for internal combustion engines. 9. A second control device (42) in the fuel conduit (15, 5, 16) controls the overflow/ The suction valve (43) and the valve shaft (48) of this overflow/suction valve (43) are The overflow/intake valve (43) consists of a switching piston (44) for the supply via a conduit (46) to the upper end of the pump chamber (6) and also to the switching piston (44). The pump chamber (45) is connected to the through passage (14) of the pump cylinder (4). The diesel internal combustion engine according to any one of claims 1 to 7, characterized in that Fuel injection system for Seki.